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Lunar Meteorite

Northwest Africa 10309, 10609, and 11029
(presumed paired stones)

Northwestern Africa

 

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Northwest Africa 10609
(photo credit: Gary Fujihara)

 

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Two sawn faces of Northwest Africa 10609
(photo credit: Gary Fujihara)

 

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Sawn faces of four of the smaller Northwest Africa 10309 stones. Click on image for enlargement.

(photo credit: Randy Korotev)

 

 

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Two sides of a lab sample of NWA 10609, polished on left. Click on image for enlargement. Thanks to Gary Fujihara for the sample
(photo credit: Randy Korotev)

 

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Northwest Africa 11029 in the field.
(photo credit: Ben Hoefnagels)

 

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Lab samle of Northwest Africa 11029. Click on image for enlargement
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 104

Northwest Africa 10309

(Northwestern Africa)
Purchased: 2015 August
Mass: 16,518 g

Classification: Lunar meteorite (feldspathic breccia)

History: A group of similar stones (total weight 16518 g, the largest weighing 6404 g) were found together at an undisclosed location in Mauritania, and were purchased by Darryl Pitt in August 2015 from a dealer in Mauritania.

 

Physical characteristics: All pieces lack fusion crust but the exteriors exhibit a thin desert patina. Interiors consist of angular white clasts (up to 1.5 cm across, some with minor red-brown staining) set within a fine grained, medium-gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral clasts of anorthite, pigeonite (some exsolved), orthopyroxene, subcalcic augite, olivine, chromite (both Ti-rich and Ti-poor varieties) in a finer grained, partly vesicular matrix containing kamacite, troilite and Ni-poor taenite.

Geochemistry: Olivine (Fa8.6-54.3, FeO/MnO = 82-96, N = 4), orthopyroxene (Fs18.7Wo2.8, FeO/MnO = 56), subcalcic augite (Fs18.1Wo31.8, FeO/MnO = 60), low-Ca pyroxene host (Fs50.4Wo6.1, FeO/MnO = 63), augite exsolution lamellae (Fs24.2Wo41.4, FeO/MnO = 50), plagioclase (An95.8-96.1Or0.2, N = 2).

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 22.16 g including one polished thin section at UWB; main mass with DPitt.

 

from The Meteoritical Bulletin, No. 105

Northwest Africa 10609

(Northwest Africa)
Purchased: 2016
Mass: 43.02 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Gary Fujihara from Morocco, 2016.

Physical characteristics: Single stone, weathered exterior without fusion crust. Cut and polished surface reveals numerous white feldspathic clasts set in a dark-gray groundmass. Some of the feldspathic clasts have a reddish tint.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a fragmental breccia with numerous olivine, pigeonite, and augite grains set in a dominant feldspathic matrix. Lithic and melt clasts with vesicles were also observed.

Geochemistry: (C. Agee and S. Spilde, UNM) Olivine Fa38.9±14.5, Fe/Mn=94±8, n=11; pigeonite Fs39.4±7.5Wo9.2±6.1, Fe/Mn=61±4, n=8; augite Fs21.1±4.7Wo38.3±3.4, Fe/Mn=50±4, n=3; plagioclase An95.7±0.7, n=6.

Classification: Lunar feldspathic breccia.

Specimens: 8.66 g including a probe mount on deposit at UNM, Gary Fujihara holds the main mass.

 

from The Meteoritical Bulletin, No. 106

Northwest Africa 11029

(Northwest Africa)
Purchased: 2016 June
Mass: 75 g

Lunar meteorite (feldspathic breccia)

History: Purchased by Ben Hoefnagels in June 2016 from a dealer in Taliouine, Morocco.

Physical characteristics: A single stone (75 g) lacking fusion crust and exhibiting whitish to beige clasts in a medium-gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular clasts of anorthite, olivine, pigeonite, subcalcic augite, augite, silica polymorph and ilmenite in a finer, fragmental matrix of the same minerals plus minor kamacite and barite.

Geochemistry: Olivine (Fa19.8-50.6, FeO/MnO = 68-83, N = 3), pigeonite (Fs24.9-39.8Wo8.4-9.6, FeO/MnO = 48-54), subcalcic augite (Fs27.6Wo29.0, FeO/MnO = 53), augite (Fs7.8Wo43.4, FeO/MnO = 30), plagioclase (An96.1-96.3Or0.1, N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: 15.1 g including a polished endcut at UWB; remainder with Mr. B. Hoefnagels.

 

Randy Says…

At 16.5 kg, NWA 10309 is one of the largest lunar meteorites.  I’ve analyzed samples from 5 different stones (A-E). NWA 10609 and NWA 11029 are probable pairs.

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The A-stone samples NWA 10309 contain variable proportions of mare basalt or mare glass (typically 50-100 µg/g Sc), but the 2 low-Sc samples of stone A plot with samples of the other 4 stones.   

 

More Information

Meteoritical Bulletin Database

NWA 10309 | 10609 | 10129

References

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

 

 

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Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 30-January-2017